Section for boilers and other containers.



HENDERSON. SECTION FOR L AND O H- R CONTAINERS.

APPLIUATIO LED 0 1, 1911.

1,025,697. v Patented May 7,1912.

A i Z v Gorryafi Hindemsan GEORGE R. HENDERSON, F PHILADELPHIA, PENNSYLVANIA, ASSIG'NOR. TO

THE

i BALDWIN LOCOMOTIVE WORKS,.OF PHILADELPHIA, PENNSYLVANIA, A COR- PORATION OF PENNSYLVANIA.

SECTION FOR BOILERS AND OTHER CONTAINERS.

Specification of Letters Patent.

Patented May 7, 1912.

Application filed October 21, 1911. Serial No. 655,870.

To all whom it may concern:

Be it known that I, Gnonon R; HnNn'rnsort, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invent ed certain Improvements in Sections for Boilers and other Containers, of which th following is a specification.

' This invention relates to certain improvernents in a boiler in which the shell is made of a series of channel sections secured together and to stay plates, although the invention can beapplled to any container in which the shell is arranged to resist inter-" nal pressures.

The main object of the invention is to so construct the channel sections that they will resist any lateral bending strains which would open the joints; the strain being only a. shearing strain upon the rivets.

A further object of the invention is to so construct the channel sections that a tight joint is provided where the sections are secured to the mud ring. i

The invention is also designed to equalize the strains and make it easier to calculate the strains thanheretofore in this type of boiler using channel sections.

Tn the accompanying drawing:l igurc 1, is asectional view of a channel section made in accordance with my invention; Fig.-

2, is a detached perspective view of a bent channel section ready to be placed in position to form the shell of a boiler; Fig. 3,

is a longitudinal sectional view of the fire box end of a locomotive boiler illustrating my invention; Fig. 4-, is an enlarged sectional-vicw on the line 4-4. Fig. 3; and

Fig. 5, is an enlarged sectional view on the line 5-5, Fig. 3.

Referring in the tirst instance to Fig. 3,

A is the outer shell ot the hoilcr made of a series of channel. sections B. The flanges b of these channel sections projcct outwardly and securcd between thcsc sections are the stay platcs t. l), l) are the U-shapcd sections forming the. fire box casing. These sections arc of the same width as the sections it and their [hinges (Z projcct inwardly. and the stay plates (3 are mounted bclwccn these flanges. The stay plzitcs arc rivctcd or otherwise sccurcd between the llangcs oi"- the outer channel sections it and hclwccn the flanges d of the fire box sections D. I

lay no claim to this particular construction.

Heretofore the channel sections have been made from fiat plates bent into shape; the plates being of an even thickness throughout, and when the plates are bent to form the channel sections the corners are rounded and the Web is usually slightly arched. I

have found that this form of section is objectionable in] that the internal pressure tends to open the joints between the stay plates and the flanges of the sections, and there is a tendency to bend the sections at the points near the rivets. Furthermore it is very ditlicult to calculate the strains on a plate of this particular contour.

The plate of my invention is preferably shaped by rolling; the Web I) being thicker at the middle than at the points Where it joins the flanges I), b. In fact, the section is thinnest on the line zv w some distance fromeach flange and the oiiter wall 1 of each flange is at right angles with. the inner wall 2 of the web, and the junction of these two walls forms a comparatively sharp edge '11, as clearly shown in Fig. 1, so that when the sections are riveted together the flange fits against the stay plate throughout its entire width. and the calking is done at the outer end of the flange between the flange and the stay plate.

The parts are so proportioned that when the section is under ordinary pressure there is no bending action of the section to open the joint between the flange and the stay plate and, if there is any bend under excessive pressure, it takes place some distance from the flange on the line indicated 'at :r -w, but the strain is a shearing strain on the rivets instead of a bending strain. The inner wall 2 of the channel section is straight and, therefore, the sections fit neatly against the mud ring E to which the sections are secured by rivet-s, Fig. 5, making a-vcry simple and tight joint. The

outer wall to of the web 6 may be of any.

curve desired. 'lhostrains on the form as illustrated can be readily calculated, insuring accuracy in construction.

I: claim v 1. A channel section for boiler and other containcrs subjected to internal pressures,

said section having a web and flanges proecting" from one side thereof; the Web be-' mg thicker at the center than at the edges and the flanges being thicker than the web adjacent thereto.

2. A section for a steam boiler or other container subjected to internal pressures, said section having a Web and flanges projecting from one side thereof; said section being curved longitudinally, the web in cross sect-ion having its inner surface straight and-its outer surface curved, the flanges and the central portion of the web being thicker than the web adjacent the flanges.

.3. A section for a boiler or other container subjected to internal pressures, having a Web and flanges, said section being curved longitudinally, the. inner surface of the web of said section being straight and the outer surface being curved, the outer surface of each flange being at right angles with the straight surface of the web, the web near each end having a'section thinner than the body of the We i 4. A boiler having an outer shell composed of a series of channel sections curved longitudinally, the flange of each section being secured to a stay plate, the inner surface of the Web of each channel section being straight, the outer surface of the web being convexly curved, and the flanges of the channel sections being thicker than the web adjacent to said flanges.

-of the web.

6. A channel section for boiler and other contalners sub ected to internal pressures, said section having a web and flange projection from oneside thereof; the web be-.

ing thicker at the center than at the edges. In testimony whereof, I have signed my name to this specification, in the'prcsence of two subscribing witnesses.

GEORGE R. HENDERSON. lVitnesscs:

LOUIS H. BENDER, J. H. Knns'r. 

